libs/RFID.MFRC522
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add optional delay after PCD_Init as workaround

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provided by DarkiStar #476
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Rotzbua
2019-06-03 00:45:05 +02:00
parent 557b71efa7
commit d36f9370ea
3 changed files with 9 additions and 4 deletions
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README.rst
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@@ -242,10 +242,11 @@ Troubleshooting
#. According to reports #101, #126 and #131, there may be a problem with the soldering on the MFRC522 breakout. You could fix this on your own.
* **Firmware Version: 0x12 = (unknown)**
* **Firmware Version: 0x12 = (unknown) or other random values**
#. The reason of this behaviour is unknown.
#. If this sometimes appear a bad connection or power source is the reason.
#. The exact reason of this behaviour is unknown.
#. Some boards need more time after `PCD_Init()` to be ready. As workaround add a `delay(4)` directly after `PCD_Init()` to give the PCD more time.
#. If this sometimes appears, a bad connection or power source is the reason.
#. If the firmware version is reported permanent, it is very likely that the hardware is a fake or has a defect. Contact your supplier.